3220-A bearing: complete specifications & equivalents
The 3220-A is a ISO 15 radial bearing sized 100 x 180 x 60.3 mm (bore x OD x width). Verify dimensions against the official catalog before ordering.
Specification table
| Parameter | Value |
|---|---|
| Brand | SKF |
| Bore diameter d | 100 mm |
| Outer diameter D | 180 mm |
| Width B | 60.3 mm |
| Material | GCr15 |
| Seal / shield | open |
| Internal clearance | CN |
| Tolerance class | P0 |
| Cage | steel, stamped ribbon (J-type) |
| Basic dynamic load rating C | 178 kN |
| Basic static load rating C0 | 166 kN |
| Fatigue load limit Pu | 6 kN |
| Reference speed (thermal) | 3800 rpm |
| Limiting speed (mechanical) | 3200 rpm |
| Operating temperature | -40 to +120 °C |
| Mass | 6100 g |
| Manufacturer designation | 3220 A |
| Standard | ISO 15 |
| Catalog version | SKF PUB BU/P1 17000/1 EN (Oct 2018) |
| Last verified | 2026-09-27 |
Source: catalog reference (SKF PUB BU/P1 17000/1 EN (Oct 2018)) · extracted 2026-09-27
Parameters extracted from the official SKF Rolling Bearings catalogue (SKF PUB BU/P1 17000/1 EN (Oct 2018)); SKF® and SKF Explorer® are trademarks of AB SKF, used here for identification only — mpnbase is not an authorized SKF distributor. Boundary dimensions are ISO 15 interchangeable; current production values may differ, verify at skf.com.
Dimensions in inches & 3200-series range
| Bore d | 3.937 in |
|---|---|
| Outer diameter D | 7.087 in |
| Width B | 2.374 in |
| ISO bore code | 20 |
| Radial section height (D−d)/2 | 40 mm |
| Smallest bore in 3200-series | 10 mm |
| Largest outer diameter in 3200-series | 200 mm |
| Width range across 3200-series | 14–69.8 mm |
| Bore position in 3200-series (smallest first) | 21 of 22 |
| Bore above smallest 3200-series size | 90 mm |
Cross references & equivalents
No verified interchange data yet. Send an inquiry and our team will confirm equivalents manually.
How the 3220-A model number is decoded
3220 A is SKF's 100 mm-bore double-row angular-contact ball bearing of the 3200 series — two ball rows back-to-back for two-direction axial location in one unit, 100×180×60.3 mm. A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage. Envelope 100×180×60.3 mm (3.937×7.087×2.374 in), 40.0 mm radial section height, C 178 kN, C0 166 kN, Pu 6 kN.reference speed 3,800 r/min (thermal) and limiting speed 3,200 r/min (mechanical), catalogue mass 6100 g. Load balance: C0 166 kN against C 178 kN gives a 0.93 ratio, typical of a double-row bidirectional design; Pu 6 kN enters the SKF adjusted-life equation rather than the basic rating life. Sizing arithmetic on the 100 mm bore: 178 kN C divided by the 40.0 mm radial section height gives 4.5 kN per section millimetre; the 6100 g mass and 3 % Pu/C share frame the light-load floor for the adjusted-life check. Bore-to-OD planning: OD 180 over bore 100 is a 1.80× step for this size, and the 60.3 mm width gives a bore/width ratio of 1.66; use these ratios when housing space around the 100 mm shaft is the first constraint.
Typical equipment & failure modes
Common applications
- process pump and agitator drives
- crane and winch gearboxes
- paper-machine dryer-section gearing
Known failure patterns
- snap-ring groove or two-piece-ring damage when the D execution is pressed home through the wrong ring
- two-direction thrust overload concentrating load on one row and spalling its raceway
- stamped steel cage noise and pocket wear in marginal-lubrication starts, where a brass-cage execution would survive
- electrical pitting on VFD-driven shafts without grounding protection
- rolling-contact fatigue spalling after the rated L10 life is exceeded
Selection pitfalls — read before you substitute
- The D executions have a two-piece inner ring: mount both halves square to each other, never press on the outer ring, and keep the split faces clean during fitting.
- Interference goes on the rotating ring (about k5 at 100 mm bore); the wide 60.3 mm ring is sensitive to tilted seats, so check squareness before clamping.
- A capped 3220-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.
- A capped 3220-2Z/-2RS1 execution of this envelope exists for sealed-for-life duty; an open double-row bearing needs application sealing and a defined lubricant supply.
- Catalogue ratings are SKF PUB BU/P1 17000 figures for 3220 A as the double a steel execution; the other order numbers of the 3220 size are different products and may carry different ratings — always quote the full designation when purchasing.
Frequently asked questions
What are the dimensions and catalogue data of 3220-A?
3220 A measures 100 mm bore × 180 mm OD × 60.3 mm width (3.937 × 7.087 × 2.374 in), mass about 6100 g. SKF 17000 ratings: C 178 kN, C0 166 kN, Pu 6 kN, reference speed 3,800 r/min (thermal) and limiting speed 3,200 r/min (mechanical).
What does the A suffix mean?
A on a double-row bearing means no filling slots, so both rows carry their full ball complement in both directions. with no cage suffix the double-row A execution uses the standard stamped steel ball-centred cage.
Why choose the double-row 3220 instead of two single-row bearings?
The double-row bearing locates the shaft in both axial directions in one unit, in one housing bore and with factory-controlled axial clearance — a more compact arrangement than a pair, with no field matching of ground faces. A single-row pair offers adjustable preload instead.
What does the D mean in A?
D marks a two-piece inner ring, used on the heavy 33-series executions to simplify mounting; the rest of the suffix identifies the cage (MA brass outer-ring-centred, M brass ball-centred, J1 stamped steel, TN9 PA66) and snap-ring/clearance options (NR, CB).
Reviewed & verified by the MPN Base engineering desk against source catalog SKF PUB BU/P1 17000/1 EN (Oct 2018) on 2026-09-27. Read our editorial & correction policy.